This part of ISO 13041 specifies, with reference to ISO 230-1 and ISO 230-7, the geometric tests on general purpose numerically controlled (NC) turning machines and tuning centres with vertical workholding spindles, as well as the corresponding applicable tolerances.

This part of ISO 13041 explains different concepts or configurations and common features of NC turning machines and turning centres with vertical workholding spindles. It also provides a terminology and designation of controlled axes (see Figures 1, 2, 3, and 4).

This part of ISO 13041 deals only with the verification of the accuracy of the machine. It does not apply to the operational testing of the machine (e.g. vibration, abnormal noise, stick slip motion of components) nor to machine characteristics (e.g. speeds, feeds) as such checks are generally carried out before testing the accuracy.